Chemistry/Additional Science

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1 Write your name here Surname Other names Pearson Edexcel GCSE Centre Number Candidate Number Chemistry/Additional Science Unit C2: Discovering Chemistry Higher Tier Tuesday 10 June 2014 Afternoon Time: 1 hour You must have: Calculator, ruler Paper Reference 5CH2H/01 Total Marks Instructions Use black ink or ball-point pen. Fill in the boxes at the top of this page with your name, centre number and candidate number. Answer all questions. Answer the questions in the spaces provided there may be more space than you need. Information The total mark for this paper is 60. The marks for each question are shown in brackets use this as a guide as to how much time to spend on each question. Questions labelled with an asterisk (*) are ones where the quality of your written communication will be assessed you should take particular care with your spelling, punctuation and grammar, as well as the clarity of expression, on these questions. Advice Read each question carefully before you start to answer it. Keep an eye on the time. Try to answer every question. Check your answers if you have time at the end. Turn over P43430RA 2014 Pearson Education Ltd. 1/1/1/1/1/ *P43430RA0120*

2 BLANK PAGE 2 *P43430RA0220*

3 The Periodic Table of the Elements Key 1 H hydrogen 1 4 He helium 2 7 Li lithium 3 9 Be beryllium 4 relative atomic mass atomic symbol name atomic (proton) number 11 B boron 5 12 C carbon 6 14 N nitrogen 7 16 O oxygen 8 19 F fluorine 9 20 Ne neon Na sodium Mg magnesium Al aluminium Si silicon P phosphorus S sulfur Cl chlorine Ar argon K potassium Ca calcium Sc scandium Ti titanium V vanadium Cr chromium Mn manganese Fe iron Co cobalt Ni nickel Cu copper Zn zinc Ga gallium Ge germanium As arsenic Se selenium Br bromine Kr krypton Rb rubidium Sr strontium Y yttrium Zr zirconium Nb niobium Mo molybdenum 42 [98] Tc technetium Ru ruthenium Rh rhodium Pd palladium Ag silver Cd cadmium In indium Sn tin Sb antimony Te tellurium I iodine Xe xenon Cs caesium Ba barium La* lanthanum Hf hafnium Ta tantalum W tungsten Re rhenium Os osmium Ir iridium Pt platinum Au gold Hg mercury Tl thallium Pb lead Bi bismuth 83 [209] Po polonium 84 [210] At astatine 85 [222] Rn radon 86 [223] Fr francium 87 [226] Ra radium 88 [227] Ac* actinium 89 [261] Rf rutherfordium 104 [262] Db dubnium 105 [266] Sg seaborgium 106 [264] Bh bohrium 107 [277] Hs hassium 108 [268] Mt meitnerium 109 [271] Ds darmstadtium 110 [272] Rg roentgenium 111 Elements with atomic numbers have been reported but not fully authenticated * The lanthanoids (atomic numbers 58-71) and the actinoids (atomic numbers ) have been omitted. The relative atomic masses of copper and chlorine have not been rounded to the nearest whole number. *P43430RA0320* 3 Turn over

4 Answer ALL questions Some questions must be answered with a cross in a box. If you change your mind about an answer, put a line through the box and then mark your new answer with a cross. Particles and formulae 1 (a) Atoms contain protons, neutrons and electrons. Complete the table to show the relative mass and relative charge of each particle and its position in an atom. (3) relative mass relative charge position in atom proton +1 neutron 1 in nucleus electron (b) Complete the sentence by putting a cross ( ) in the box next to your answer. An atom of an element always contains A more protons than neutrons B C D equal numbers of protons and neutrons more electrons than protons equal numbers of protons and electrons (c) The symbols for some atoms are given in the box Ca Cl K N Ne O From the box, choose the symbol of (i) an atom in group 2 of the periodic table... (ii) an atom that readily forms an ion with a charge of *P43430RA0420*

5 (d) The formula of aluminium nitrate is Al(NO 3 ) 3 (i) State the total number of atoms in the formula Al(NO 3 ) 3 (ii) What is the most likely formula of aluminium nitride?... Put a cross ( A Al(NO 3 ) 2 ) in the box next to your answer. B AlNO 3 C AlNO 2 D AlN (Total for Question 1 = 8 marks) *P43430RA0520* 5 Turn over

6 BLANK PAGE 6 *P43430RA0620*

7 Rates of reactions and energy changes 2 (a) Marble chips react with hydrochloric acid to produce carbon dioxide. The equation for the reaction is CaCO 3 + 2HCl CaCl 2 + H 2 O + CO 2 Which one of these changes would decrease the rate of this reaction? Put a cross ( ) in the box next to your answer. A use hydrochloric acid which is more dilute B C use smaller sized marble chips use marble chips which have a larger surface area D use a larger volume of the hydrochloric acid (b) Explain why increasing the temperature of a reaction increases the rate of the reaction. *P43430RA0720* 7 Turn over

8 (c) (i) The rate of decomposition of hydrogen peroxide can be increased by adding a catalyst. Which of these graphs shows the mass of the catalyst during the reaction? Put a cross ( ) in the box next to your answer. A mass of catalyst 0 0 time mass of catalyst B 0 0 time mass of catalyst C 0 0 time mass of catalyst D 0 0 time 8 *P43430RA0820*

9 (ii) The decomposition of hydrogen peroxide, H 2 O 2, produces oxygen and water. Give the balanced equation for this reaction. (d) Explain, in terms of the energy involved in the breaking of bonds and in the making of bonds, why some reactions are exothermic. (Total for Question 2 = 8 marks) *P43430RA0920* 9 Turn over

10 Metals 3 There are many metallic elements in the periodic table. (a) Which row of the table correctly shows two metals that are in group 1 and two metals that are transition metals? Put a cross ( ) in the box next to your answer. group 1 transition metals A lithium and zinc calcium and copper B potassium and caesium copper and iron C sodium and potassium copper and magnesium D sodium and magnesium manganese and nickel (b) (i) Describe the structure of metals in terms of the particles present in their structures. (ii) Explain how metals conduct electricity. 10 *P43430RA01020*

11 (c) (i) Describe what you would see when a small piece of sodium is added to water. (ii) Write the balanced equation for the reaction of sodium with water to form sodium hydroxide and hydrogen. (3) (Total for Question 3 = 10 marks) *P43430RA01120* 11 Turn over

12 Salts and analysis 4 (a) Which of the following pairs of substances contains one substance that is soluble in water and one that is insoluble in water? Put a cross ( ) in the box next to your answer. A aluminium nitrate and lead sulfate B C ammonium chloride and copper sulfate copper hydroxide and lead sulfate D sodium hydroxide and potassium nitrate (b) Barium chloride is an ionic compound and has a high melting point. Explain why barium chloride has a high melting point. (c) Barium chloride solution is used to test for the presence of sulfate ions in a solution. When sulfate ions are present, insoluble barium sulfate is formed. (i) Describe the appearance of barium sulfate. (ii) Complete the balanced equation for the reaction between barium chloride and potassium sulfate. BaCl 2 + K 2 SO *P43430RA01220*

13 (d) Compound X is a metal carbonate. (i) A flame test was carried out on compound X. A lilac flame was seen. Complete the sentence by putting a cross ( The formula of the metal ion in compound X is ) in the box next to your answer. A Ca 2+ B Cu 2+ C K + D Na + (ii) Lead carbonate is an insoluble salt. Describe how a pure, dry sample of solid lead carbonate can be obtained from sodium carbonate solution and lead nitrate solution. (3) (Total for Question 4 = 10 marks) *P43430RA01320* 13 Turn over

14 Chlorine and carbon 5 (a) Chlorine has an atomic number of 17. Chlorine-35 and chlorine-37 are two isotopes of chlorine. (i) Complete the table to show the numbers of protons, neutrons and electrons in each of the isotopes. chlorine-35 chlorine-37 number of protons number of neutrons number of electrons (ii) A normal sample of chlorine contains only chlorine-35 and chlorine-37 atoms. Explain why the relative atomic mass of chlorine is 35.5 (b) Tetrachloromethane is a simple molecular, covalent compound. The formula of its molecule is CCl 4. There are four electrons in the outer shell of a carbon atom. There are seven electrons in the outer shell of a chlorine atom. Draw a dot and cross diagram to show the bonding in a molecule of tetrachloromethane, CCl 4. Show outer shell electrons only. 14 *P43430RA01420*

15 *(c) The diagrams show the arrangements of carbon atoms in diamond and in graphite. = carbon atom strong bonds strong bonds diamond graphite Compare a use of diamond with a use of graphite, explaining each use in terms of the bonding and structure. In your answer you should use information from the diagrams. (6) (Total for Question 5 = 12 marks) *P43430RA01520* 15 Turn over

16 BLANK PAGE 16 *P43430RA01620*

17 Group 7 elements 6 (a) A compound of iron and chlorine was formed by reacting 2.80 g of iron with 3.55 g of chlorine. Calculate the empirical formula of the compound. (relative atomic masses: Cl = 35.5, Fe = 56.0) (3) (b) Sodium reacts with chlorine to form sodium chloride. 2Na + Cl 2 2NaCl empirical formula... Calculate the maximum mass of sodium chloride that could be formed by reacting 9.20 g of sodium with excess chlorine. (relative atomic masses: Na = 23.0, Cl = 35.5) (3) mass of sodium chloride... g *P43430RA01720* 17 Turn over

18 *(c) Chlorine, bromine and iodine are in group 7 of the periodic table. The order of reactivity of these three elements can be shown by carrying out displacement experiments. You are provided with potassium bromide solution potassium chloride solution potassium iodide solution bromine solution chlorine solution iodine solution Describe how these solutions could be used to carry out experiments to show the order of reactivity of bromine, chlorine and iodine, explaining how the results would show the order of reactivity. You may use equations if you wish. (6) 18 *P43430RA01820*

19 (Total for Question 6 = 12 marks) TOTAL FOR PAPER = 60 MARKS *P43430RA01920* 19

20 BLANK PAGE 20 *P43430RA02020*

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